History of Terrane Assembly, Eastern New England

新英格兰东部地体组装的历史

• 批准号: 9418203
• 负责人: Robert Wintsch
• 金额: $ 12万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-05-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418203&HistoricalAwards=false
• 关键词: History; Terrane; Assembly; Eastern; New

9418203 Wintsch Terrane assembly and metamorphism are common events in most orogenic belts, and the well studied New England orogen is no exception. However, there is a fundamental difference in the tectono-metamorphic histories of western and eastern New England. In the west, terranes were assembled prior to, or during loading and metamorphism as metamorphic isograds are not displaced by terrane boundaries. In southeastern New England, on the other hand, the terranes were metamorphosed prior to assembly and evidence is mounting that find assembly occurred in the Alleghanian. The broarder significance of the difference is not clear, partly because of a large data gap in eastern New England. This project involves thermochronlogic study of eastern lithotectonic terranes in this data gap to determine if significant post-Metamorphic faulting occurred during the assembly of terranes in all of eastern New England, and what factors are responsible for the resulting pattern. Results will help unravel the timing of metamorphism and terrane juxtaposition for New England, which should be of interest in other, less well known, orogens.

小行星9418203 地体组合和变质作用是大多数造山带中常见的事件，研究得很好的新英格兰造山带也不例外。 然而，新英格兰西部和东部的构造变质历史存在根本差异。 在西部，由于变质等梯度线不被岩石圈边界所取代，岩石圈在加载和变质作用之前或期间被组装。 另一方面，在新英格兰的东南部，阿莱格里人在聚集之前就已经变质了，越来越多的证据表明，阿莱格里人的聚集发生在阿莱格里人身上。 这一差异的更广泛意义尚不清楚，部分原因是新英格兰东部的数据缺口很大。 该项目涉及东部岩石构造断层的热年代学研究，以确定是否发生了重大的后变质断层组装过程中的所有新英格兰，以及什么因素是负责所产生的模式。 这些结果将有助于解开新英格兰变质作用和岩石并置的时间，这应该是其他不太为人所知的造山带所感兴趣的。